/**
 * BibSonomy-Scraper - Web page scrapers returning BibTeX for BibSonomy.
 *
 * Copyright (C) 2006 - 2016 Knowledge & Data Engineering Group,
 *                               University of Kassel, Germany
 *                               http://www.kde.cs.uni-kassel.de/
 *                           Data Mining and Information Retrieval Group,
 *                               University of Würzburg, Germany
 *                               http://www.is.informatik.uni-wuerzburg.de/en/dmir/
 *                           L3S Research Center,
 *                               Leibniz University Hannover, Germany
 *                               http://www.l3s.de/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.bibsonomy.scraper.url.kde.zenodo;

import static org.bibsonomy.util.ValidationUtils.present;

import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.bibsonomy.common.Pair;
import org.bibsonomy.scraper.AbstractUrlScraper;
import org.bibsonomy.scraper.exceptions.ScrapingException;
import org.bibsonomy.scraper.generic.AbstractGenericFormatURLScraper;
import org.bibsonomy.util.UrlUtils;
import org.bibsonomy.util.id.DOIUtils;

/**
 * Scraper for Zenodo.org
 * 
 * @author rja
 */
public class ZenodoScraper extends AbstractGenericFormatURLScraper {
	private static final Log log = LogFactory.getLog(ZenodoScraper.class);
	
	private static final String SITE_NAME = "Zenodo";
	private static final String SITE_URL = "https://zenodo.org/";
	private static final String INFO = "This scraper parses a publication page from " + href(SITE_URL, SITE_NAME)+".";
	
	private static final List<Pair<Pattern,Pattern>> patterns = new LinkedList<Pair<Pattern,Pattern>>();
	static{
	    patterns.add(new Pair<Pattern, Pattern>(Pattern.compile("zenodo.org"), Pattern.compile("/record/.*")));
	}

    private static final Pattern PRE_BLOCK = Pattern.compile("<pre.*?>(@.*?)</pre>", Pattern.MULTILINE | Pattern.DOTALL);
	
	@Override
	protected String getDownloadURL(URL url, String cookies) throws ScrapingException, IOException {
	    return url.toString() + "/export/hx";
	}

    @Override
	protected final String convert(String downloadResult) {
	// extract BibTeX from <pre> block
	final Matcher match = PRE_BLOCK.matcher(downloadResult);
	if (match.find()) {
	    return match.group(1);
	}
	return null;
    }
    
	@Override
	public String getInfo() {
		return INFO;
	}

	@Override
	public List<Pair<Pattern, Pattern>> getUrlPatterns() {
		return patterns;
	}
	
	@Override
	public String getSupportedSiteName() {
		return SITE_NAME;
	}
	
	@Override
	public String getSupportedSiteURL() {
		return SITE_URL;
	}
}
